Thanks for the quick reply John! Now it makes a lot more sense. The next dumb question is what is SVN and where can I find more bout it?
John Hunter-4 wrote: > > On Fri, Jan 16, 2009 at 10:33 AM, antonv <vasilescu_an...@yahoo.com> > wrote: >> >> I have a series of 18 separate colors to create my cmap but I would like >> to >> convert that to a continuous map which interpolates all the other values >> in >> between my chosen colors. This should be really easy but I am not sure >> how >> can it be solved. Any ideas? > > Although the logic of the LinearSegmentedColormap takes some time to > get your head around, it is pretty easy. > > > http://matplotlib.sourceforge.net/api/colors_api.html#matplotlib.colors.LinearSegmentedColormap > > > Here is an example: > > import numpy as np > import matplotlib.pyplot as plt > import matplotlib.colors as mcolors > import matplotlib.cm as cm > colors = 'red', 'green', 'blue', 'yellow', 'orange' > > ncolors = len(colors) > > vals = np.linspace(0., 1., ncolors) > > cdict = dict(red=[], green=[], blue=[]) > for val, color in zip(vals, colors): > r,g,b = mcolors.colorConverter.to_rgb(color) > cdict['red'].append((val, r, r)) > cdict['green'].append((val, g, g)) > cdict['blue'].append((val, b, b)) > > cmap = mcolors.LinearSegmentedColormap('mycolors', cdict) > > > x = np.arange(10000.).reshape((100,100)) > > plt.imshow(x, cmap=cmap) > > plt.show() > > See also > http://matplotlib.sourceforge.net/examples/pylab_examples/custom_cmap.html. > I just added a function to svn to support this, so with svn you can > do > > > colors = 'red', 'gray', 'green' > cmap = mcolors.LinearSegmentedColormap.from_list('mycolors', colors) > X, Y = np.meshgrid(np.arange(10), np.arange(10)) > plt.imshow(X+Y, cmap=cmap) > > JDH > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > http://p.sf.net/sfu/sf-spreadtheword > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > -- View this message in context: http://www.nabble.com/cmap-from-sepparate-color-values-tp21503197p21512920.html Sent from the matplotlib - users mailing list archive at Nabble.com. ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
